Question

A secondary oocyte has a________ chromosome number while a fertilized ovum has_________ chromosome number.

• A. haploid $n=23$
• B. diploid $2n=46$

Answer 1

Reproductive part - Ovary.

1. Ovaries are small almond-shaped structures and are present in the lower region of the abdomen in females. One egg matures in the ovary alternatively. This is referred to as oogenesis.
2. This oogenesis leads to the formation of the egg.
3. Located on either side of uterus, ovary plays a vital role in menstrual cycle in females.

The number of chromosomes in secondary oocyte and fertilized ovum

1. The egg or the female gamete is formed by the meiotic division. Hence it has a haploid set of chromosomes in it.
2. The secondary oocyte the precursor of the ovum is a resultant structure of the meiosis I division. Hence it will also have a haploid set of chromosomes that is $n=23$
3. A fertilized ovum is the ovum that has fused with sperm. Hence it will have a diploid set of chromosomes that is $2n=46$

Final Answer:

A secondary oocyte has a Haploid $n=23$ chromosomes number while a fertilized ovum has a Diploid $2n=46$chromosomes number.